Billionaire businessman Michael Rubin on Tuesday - and it had over 350 celebrity attendees including Jay-Z and Beyoncé, Kim Kardashian, Kendall Jenner, Jennifer Lopez, , and Leonardo Di Caprio, among others.The star-studded celebration, which took place at Michael's glamorous $50 million Hamptons pad, raised the question: how did the CEO of a sports clothing manufacturer come to host one of the most exclusive events among Hollywood's elite?It turns out, Michael, 50, has spent years cultivating his impressive list of celebrity friends and cementing his reputation as the industry's top party host.
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